11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * common UDP/RAW code 31da177e4SLinus Torvalds * Linux INET6 implementation 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Authors: 61da177e4SLinus Torvalds * Pedro Roque <roque@di.fc.ul.pt> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 91da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 101da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 111da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds 144fc268d2SRandy Dunlap #include <linux/capability.h> 151da177e4SLinus Torvalds #include <linux/errno.h> 161da177e4SLinus Torvalds #include <linux/types.h> 171da177e4SLinus Torvalds #include <linux/kernel.h> 181da177e4SLinus Torvalds #include <linux/interrupt.h> 191da177e4SLinus Torvalds #include <linux/socket.h> 201da177e4SLinus Torvalds #include <linux/sockios.h> 211da177e4SLinus Torvalds #include <linux/in6.h> 221da177e4SLinus Torvalds #include <linux/ipv6.h> 231da177e4SLinus Torvalds #include <linux/route.h> 245a0e3ad6STejun Heo #include <linux/slab.h> 25a495f836SChris Elston #include <linux/export.h> 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds #include <net/ipv6.h> 281da177e4SLinus Torvalds #include <net/ndisc.h> 291da177e4SLinus Torvalds #include <net/addrconf.h> 301da177e4SLinus Torvalds #include <net/transp_v6.h> 311da177e4SLinus Torvalds #include <net/ip6_route.h> 32c752f073SArnaldo Carvalho de Melo #include <net/tcp_states.h> 33e7219858SYOSHIFUJI Hideaki / 吉藤英明 #include <net/dsfield.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include <linux/errqueue.h> 361da177e4SLinus Torvalds #include <asm/uaccess.h> 371da177e4SLinus Torvalds 38a50feda5SEric Dumazet static bool ipv6_mapped_addr_any(const struct in6_addr *a) 39c15fea2dSMax Matveev { 40a50feda5SEric Dumazet return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); 41c15fea2dSMax Matveev } 42c15fea2dSMax Matveev 431da177e4SLinus Torvalds int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 441da177e4SLinus Torvalds { 451da177e4SLinus Torvalds struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; 461da177e4SLinus Torvalds struct inet_sock *inet = inet_sk(sk); 471da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4820c59de2SArnaud Ebalard struct in6_addr *daddr, *final_p, final; 491da177e4SLinus Torvalds struct dst_entry *dst; 504c9483b2SDavid S. Miller struct flowi6 fl6; 511da177e4SLinus Torvalds struct ip6_flowlabel *flowlabel = NULL; 5220c59de2SArnaud Ebalard struct ipv6_txoptions *opt; 531da177e4SLinus Torvalds int addr_type; 541da177e4SLinus Torvalds int err; 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds if (usin->sin6_family == AF_INET) { 571da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) 581da177e4SLinus Torvalds return -EAFNOSUPPORT; 591da177e4SLinus Torvalds err = ip4_datagram_connect(sk, uaddr, addr_len); 601da177e4SLinus Torvalds goto ipv4_connected; 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds if (addr_len < SIN6_LEN_RFC2133) 641da177e4SLinus Torvalds return -EINVAL; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds if (usin->sin6_family != AF_INET6) 671da177e4SLinus Torvalds return -EAFNOSUPPORT; 681da177e4SLinus Torvalds 694c9483b2SDavid S. Miller memset(&fl6, 0, sizeof(fl6)); 701da177e4SLinus Torvalds if (np->sndflow) { 714c9483b2SDavid S. Miller fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; 724c9483b2SDavid S. Miller if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 734c9483b2SDavid S. Miller flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 7463159f29SIan Morris if (!flowlabel) 751da177e4SLinus Torvalds return -EINVAL; 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds addr_type = ipv6_addr_type(&usin->sin6_addr); 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_ANY) { 821da177e4SLinus Torvalds /* 831da177e4SLinus Torvalds * connect to self 841da177e4SLinus Torvalds */ 851da177e4SLinus Torvalds usin->sin6_addr.s6_addr[15] = 0x01; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds daddr = &usin->sin6_addr; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds if (addr_type == IPV6_ADDR_MAPPED) { 911da177e4SLinus Torvalds struct sockaddr_in sin; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds if (__ipv6_only_sock(sk)) { 941da177e4SLinus Torvalds err = -ENETUNREACH; 951da177e4SLinus Torvalds goto out; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds sin.sin_family = AF_INET; 981da177e4SLinus Torvalds sin.sin_addr.s_addr = daddr->s6_addr32[3]; 991da177e4SLinus Torvalds sin.sin_port = usin->sin6_port; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds err = ip4_datagram_connect(sk, 1021da177e4SLinus Torvalds (struct sockaddr *) &sin, 1031da177e4SLinus Torvalds sizeof(sin)); 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds ipv4_connected: 1061da177e4SLinus Torvalds if (err) 1071da177e4SLinus Torvalds goto out; 1081da177e4SLinus Torvalds 109efe4208fSEric Dumazet ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); 1101da177e4SLinus Torvalds 111c15fea2dSMax Matveev if (ipv6_addr_any(&np->saddr) || 112c15fea2dSMax Matveev ipv6_mapped_addr_any(&np->saddr)) 113c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); 1141da177e4SLinus Torvalds 115efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 116efe4208fSEric Dumazet ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { 117c720c7e8SEric Dumazet ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, 118efe4208fSEric Dumazet &sk->sk_v6_rcv_saddr); 119719f8358SEric Dumazet if (sk->sk_prot->rehash) 120719f8358SEric Dumazet sk->sk_prot->rehash(sk); 121719f8358SEric Dumazet } 122b301e82cSBrian Haley 1231da177e4SLinus Torvalds goto out; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 126842df073SHannes Frederic Sowa if (__ipv6_addr_needs_scope_id(addr_type)) { 1271da177e4SLinus Torvalds if (addr_len >= sizeof(struct sockaddr_in6) && 1281da177e4SLinus Torvalds usin->sin6_scope_id) { 1291da177e4SLinus Torvalds if (sk->sk_bound_dev_if && 1301da177e4SLinus Torvalds sk->sk_bound_dev_if != usin->sin6_scope_id) { 1311da177e4SLinus Torvalds err = -EINVAL; 1321da177e4SLinus Torvalds goto out; 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds sk->sk_bound_dev_if = usin->sin6_scope_id; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371ac4f008SBrian Haley if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) 1381ac4f008SBrian Haley sk->sk_bound_dev_if = np->mcast_oif; 1391ac4f008SBrian Haley 1401da177e4SLinus Torvalds /* Connect to link-local address requires an interface */ 1411da177e4SLinus Torvalds if (!sk->sk_bound_dev_if) { 1421da177e4SLinus Torvalds err = -EINVAL; 1431da177e4SLinus Torvalds goto out; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 147efe4208fSEric Dumazet sk->sk_v6_daddr = *daddr; 1484c9483b2SDavid S. Miller np->flow_label = fl6.flowlabel; 1491da177e4SLinus Torvalds 150c720c7e8SEric Dumazet inet->inet_dport = usin->sin6_port; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* 1531da177e4SLinus Torvalds * Check for a route to destination an obtain the 1541da177e4SLinus Torvalds * destination cache for it. 1551da177e4SLinus Torvalds */ 1561da177e4SLinus Torvalds 1574c9483b2SDavid S. Miller fl6.flowi6_proto = sk->sk_protocol; 158efe4208fSEric Dumazet fl6.daddr = sk->sk_v6_daddr; 1594e3fd7a0SAlexey Dobriyan fl6.saddr = np->saddr; 1604c9483b2SDavid S. Miller fl6.flowi6_oif = sk->sk_bound_dev_if; 1614c9483b2SDavid S. Miller fl6.flowi6_mark = sk->sk_mark; 1621958b856SDavid S. Miller fl6.fl6_dport = inet->inet_dport; 1631958b856SDavid S. Miller fl6.fl6_sport = inet->inet_sport; 1641da177e4SLinus Torvalds 1654c9483b2SDavid S. Miller if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) 1664c9483b2SDavid S. Miller fl6.flowi6_oif = np->mcast_oif; 1671da177e4SLinus Torvalds 1684c9483b2SDavid S. Miller security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 169beb8d13bSVenkat Yekkirala 17020c59de2SArnaud Ebalard opt = flowlabel ? flowlabel->opt : np->opt; 1714c9483b2SDavid S. Miller final_p = fl6_update_dst(&fl6, opt, &final); 1721da177e4SLinus Torvalds 1730e0d44abSSteffen Klassert dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 17468d0c6d3SDavid S. Miller err = 0; 17568d0c6d3SDavid S. Miller if (IS_ERR(dst)) { 17668d0c6d3SDavid S. Miller err = PTR_ERR(dst); 1771da177e4SLinus Torvalds goto out; 17814e50e57SDavid S. Miller } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* source address lookup done in ip6_dst_lookup */ 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds if (ipv6_addr_any(&np->saddr)) 1834e3fd7a0SAlexey Dobriyan np->saddr = fl6.saddr; 1841da177e4SLinus Torvalds 185efe4208fSEric Dumazet if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 186efe4208fSEric Dumazet sk->sk_v6_rcv_saddr = fl6.saddr; 187c720c7e8SEric Dumazet inet->inet_rcv_saddr = LOOPBACK4_IPV6; 188719f8358SEric Dumazet if (sk->sk_prot->rehash) 189719f8358SEric Dumazet sk->sk_prot->rehash(sk); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds ip6_dst_store(sk, dst, 193efe4208fSEric Dumazet ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? 194efe4208fSEric Dumazet &sk->sk_v6_daddr : NULL, 1958e1ef0a9SYOSHIFUJI Hideaki #ifdef CONFIG_IPV6_SUBTREES 1964c9483b2SDavid S. Miller ipv6_addr_equal(&fl6.saddr, &np->saddr) ? 1978e1ef0a9SYOSHIFUJI Hideaki &np->saddr : 1988e1ef0a9SYOSHIFUJI Hideaki #endif 1998e1ef0a9SYOSHIFUJI Hideaki NULL); 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds sk->sk_state = TCP_ESTABLISHED; 202b73c3d0eSTom Herbert ip6_set_txhash(sk); 2031da177e4SLinus Torvalds out: 2041da177e4SLinus Torvalds fl6_sock_release(flowlabel); 2051da177e4SLinus Torvalds return err; 2061da177e4SLinus Torvalds } 207a495f836SChris Elston EXPORT_SYMBOL_GPL(ip6_datagram_connect); 2081da177e4SLinus Torvalds 20982b276cdSHannes Frederic Sowa int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, 21082b276cdSHannes Frederic Sowa int addr_len) 21182b276cdSHannes Frederic Sowa { 21282b276cdSHannes Frederic Sowa DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); 21382b276cdSHannes Frederic Sowa if (sin6->sin6_family != AF_INET6) 21482b276cdSHannes Frederic Sowa return -EAFNOSUPPORT; 21582b276cdSHannes Frederic Sowa return ip6_datagram_connect(sk, uaddr, addr_len); 21682b276cdSHannes Frederic Sowa } 21782b276cdSHannes Frederic Sowa EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); 21882b276cdSHannes Frederic Sowa 2191da177e4SLinus Torvalds void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 220e69a4adcSAl Viro __be16 port, u32 info, u8 *payload) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 223cc70ab26SArnaldo Carvalho de Melo struct icmp6hdr *icmph = icmp6_hdr(skb); 2241da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds if (!np->recverr) 2271da177e4SLinus Torvalds return; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds skb = skb_clone(skb, GFP_ATOMIC); 2301da177e4SLinus Torvalds if (!skb) 2311da177e4SLinus Torvalds return; 2321da177e4SLinus Torvalds 233d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 234d40a4de0SBrian Haley 2351da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2361da177e4SLinus Torvalds serr->ee.ee_errno = err; 2371da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; 2381da177e4SLinus Torvalds serr->ee.ee_type = icmph->icmp6_type; 2391da177e4SLinus Torvalds serr->ee.ee_code = icmph->icmp6_code; 2401da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2411da177e4SLinus Torvalds serr->ee.ee_info = info; 2421da177e4SLinus Torvalds serr->ee.ee_data = 0; 243d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - 244d56f90a7SArnaldo Carvalho de Melo skb_network_header(skb); 2451da177e4SLinus Torvalds serr->port = port; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds __skb_pull(skb, payload - skb->data); 248bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2511da177e4SLinus Torvalds kfree_skb(skb); 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2544c9483b2SDavid S. Miller void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) 2551da177e4SLinus Torvalds { 2561da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 2571da177e4SLinus Torvalds struct sock_exterr_skb *serr; 2581da177e4SLinus Torvalds struct ipv6hdr *iph; 2591da177e4SLinus Torvalds struct sk_buff *skb; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds if (!np->recverr) 2621da177e4SLinus Torvalds return; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2651da177e4SLinus Torvalds if (!skb) 2661da177e4SLinus Torvalds return; 2671da177e4SLinus Torvalds 268d40a4de0SBrian Haley skb->protocol = htons(ETH_P_IPV6); 269d40a4de0SBrian Haley 2701ced98e8SArnaldo Carvalho de Melo skb_put(skb, sizeof(struct ipv6hdr)); 2711ced98e8SArnaldo Carvalho de Melo skb_reset_network_header(skb); 2720660e03fSArnaldo Carvalho de Melo iph = ipv6_hdr(skb); 2734e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 2761da177e4SLinus Torvalds serr->ee.ee_errno = err; 2771da177e4SLinus Torvalds serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 2781da177e4SLinus Torvalds serr->ee.ee_type = 0; 2791da177e4SLinus Torvalds serr->ee.ee_code = 0; 2801da177e4SLinus Torvalds serr->ee.ee_pad = 0; 2811da177e4SLinus Torvalds serr->ee.ee_info = info; 2821da177e4SLinus Torvalds serr->ee.ee_data = 0; 283d56f90a7SArnaldo Carvalho de Melo serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 2841958b856SDavid S. Miller serr->port = fl6->fl6_dport; 2851da177e4SLinus Torvalds 28627a884dcSArnaldo Carvalho de Melo __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 287bd82393cSArnaldo Carvalho de Melo skb_reset_transport_header(skb); 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds if (sock_queue_err_skb(sk, skb)) 2901da177e4SLinus Torvalds kfree_skb(skb); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2934c9483b2SDavid S. Miller void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) 2944b340ae2SBrian Haley { 2954b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 2964b340ae2SBrian Haley struct ipv6hdr *iph; 2974b340ae2SBrian Haley struct sk_buff *skb; 2984b340ae2SBrian Haley struct ip6_mtuinfo *mtu_info; 2994b340ae2SBrian Haley 3004b340ae2SBrian Haley if (!np->rxopt.bits.rxpmtu) 3014b340ae2SBrian Haley return; 3024b340ae2SBrian Haley 3034b340ae2SBrian Haley skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 3044b340ae2SBrian Haley if (!skb) 3054b340ae2SBrian Haley return; 3064b340ae2SBrian Haley 3074b340ae2SBrian Haley skb_put(skb, sizeof(struct ipv6hdr)); 3084b340ae2SBrian Haley skb_reset_network_header(skb); 3094b340ae2SBrian Haley iph = ipv6_hdr(skb); 3104e3fd7a0SAlexey Dobriyan iph->daddr = fl6->daddr; 3114b340ae2SBrian Haley 3124b340ae2SBrian Haley mtu_info = IP6CBMTU(skb); 3134b340ae2SBrian Haley 3144b340ae2SBrian Haley mtu_info->ip6m_mtu = mtu; 3154b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_family = AF_INET6; 3164b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_port = 0; 3174b340ae2SBrian Haley mtu_info->ip6m_addr.sin6_flowinfo = 0; 3184c9483b2SDavid S. Miller mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; 3194e3fd7a0SAlexey Dobriyan mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; 3204b340ae2SBrian Haley 3214b340ae2SBrian Haley __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 3224b340ae2SBrian Haley skb_reset_transport_header(skb); 3234b340ae2SBrian Haley 3244b340ae2SBrian Haley skb = xchg(&np->rxpmtu, skb); 3254b340ae2SBrian Haley kfree_skb(skb); 3264b340ae2SBrian Haley } 3274b340ae2SBrian Haley 32834b99df4SJulian Anastasov /* For some errors we have valid addr_offset even with zero payload and 32934b99df4SJulian Anastasov * zero port. Also, addr_offset should be supported if port is set. 33034b99df4SJulian Anastasov */ 33134b99df4SJulian Anastasov static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) 33234b99df4SJulian Anastasov { 33334b99df4SJulian Anastasov return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || 33434b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 33534b99df4SJulian Anastasov serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 33634b99df4SJulian Anastasov } 33734b99df4SJulian Anastasov 338c247f053SWillem de Bruijn /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. 339c247f053SWillem de Bruijn * 340c247f053SWillem de Bruijn * At one point, excluding local errors was a quick test to identify icmp/icmp6 341c247f053SWillem de Bruijn * errors. This is no longer true, but the test remained, so the v6 stack, 342c247f053SWillem de Bruijn * unlike v4, also honors cmsg requests on all wifi and timestamp errors. 343c247f053SWillem de Bruijn * 344c247f053SWillem de Bruijn * Timestamp code paths do not initialize the fields expected by cmsg: 345c247f053SWillem de Bruijn * the PKTINFO fields in skb->cb[]. Fill those in here. 346c247f053SWillem de Bruijn */ 347c247f053SWillem de Bruijn static bool ip6_datagram_support_cmsg(struct sk_buff *skb, 348c247f053SWillem de Bruijn struct sock_exterr_skb *serr) 349829ae9d6SWillem de Bruijn { 350c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 351c247f053SWillem de Bruijn serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) 352c247f053SWillem de Bruijn return true; 353c247f053SWillem de Bruijn 354c247f053SWillem de Bruijn if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) 355c247f053SWillem de Bruijn return false; 356c247f053SWillem de Bruijn 357c247f053SWillem de Bruijn if (!skb->dev) 358c247f053SWillem de Bruijn return false; 359829ae9d6SWillem de Bruijn 360829ae9d6SWillem de Bruijn if (skb->protocol == htons(ETH_P_IPV6)) 361c247f053SWillem de Bruijn IP6CB(skb)->iif = skb->dev->ifindex; 362829ae9d6SWillem de Bruijn else 363c247f053SWillem de Bruijn PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; 364c247f053SWillem de Bruijn 365c247f053SWillem de Bruijn return true; 366829ae9d6SWillem de Bruijn } 367829ae9d6SWillem de Bruijn 3681da177e4SLinus Torvalds /* 3691da177e4SLinus Torvalds * Handle MSG_ERRQUEUE 3701da177e4SLinus Torvalds */ 37185fbaa75SHannes Frederic Sowa int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3741da177e4SLinus Torvalds struct sock_exterr_skb *serr; 375364a9e93SWillem de Bruijn struct sk_buff *skb; 376342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 3771da177e4SLinus Torvalds struct { 3781da177e4SLinus Torvalds struct sock_extended_err ee; 3791da177e4SLinus Torvalds struct sockaddr_in6 offender; 3801da177e4SLinus Torvalds } errhdr; 3811da177e4SLinus Torvalds int err; 3821da177e4SLinus Torvalds int copied; 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds err = -EAGAIN; 385364a9e93SWillem de Bruijn skb = sock_dequeue_err_skb(sk); 38663159f29SIan Morris if (!skb) 3871da177e4SLinus Torvalds goto out; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds copied = skb->len; 3901da177e4SLinus Torvalds if (copied > len) { 3911da177e4SLinus Torvalds msg->msg_flags |= MSG_TRUNC; 3921da177e4SLinus Torvalds copied = len; 3931da177e4SLinus Torvalds } 39451f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 3951da177e4SLinus Torvalds if (err) 3961da177e4SLinus Torvalds goto out_free_skb; 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds sock_recv_timestamp(msg, sk, skb); 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds serr = SKB_EXT_ERR(skb); 4011da177e4SLinus Torvalds 40234b99df4SJulian Anastasov if (sin && ipv6_datagram_support_addr(serr)) { 403d56f90a7SArnaldo Carvalho de Melo const unsigned char *nh = skb_network_header(skb); 4041da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 4051da177e4SLinus Torvalds sin->sin6_flowinfo = 0; 4061da177e4SLinus Torvalds sin->sin6_port = serr->port; 407d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4086c40d100SYOSHIFUJI Hideaki / 吉藤英明 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), 4096c40d100SYOSHIFUJI Hideaki / 吉藤英明 struct ipv6hdr, daddr); 4106c40d100SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_addr = ip6h->daddr; 4111da177e4SLinus Torvalds if (np->sndflow) 4126502ca52SYOSHIFUJI Hideaki / 吉藤英明 sin->sin6_flowinfo = ip6_flowinfo(ip6h); 413842df073SHannes Frederic Sowa sin->sin6_scope_id = 414842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 415842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4161da177e4SLinus Torvalds } else { 417b301e82cSBrian Haley ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), 418b301e82cSBrian Haley &sin->sin6_addr); 419842df073SHannes Frederic Sowa sin->sin6_scope_id = 0; 4201da177e4SLinus Torvalds } 42185fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 4251da177e4SLinus Torvalds sin = &errhdr.offender; 426f812116bSWillem de Bruijn memset(sin, 0, sizeof(*sin)); 427c247f053SWillem de Bruijn 428c247f053SWillem de Bruijn if (ip6_datagram_support_cmsg(skb, serr)) { 4291da177e4SLinus Torvalds sin->sin6_family = AF_INET6; 430c247f053SWillem de Bruijn if (np->rxopt.all) 4314b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 432d40a4de0SBrian Haley if (skb->protocol == htons(ETH_P_IPV6)) { 4334e3fd7a0SAlexey Dobriyan sin->sin6_addr = ipv6_hdr(skb)->saddr; 4341da177e4SLinus Torvalds if (np->rxopt.all) 4354b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 436842df073SHannes Frederic Sowa sin->sin6_scope_id = 437842df073SHannes Frederic Sowa ipv6_iface_scope_id(&sin->sin6_addr, 438842df073SHannes Frederic Sowa IP6CB(skb)->iif); 4391da177e4SLinus Torvalds } else { 440b301e82cSBrian Haley ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, 441b301e82cSBrian Haley &sin->sin6_addr); 442f812116bSWillem de Bruijn if (inet_sk(sk)->cmsg_flags) 4431da177e4SLinus Torvalds ip_cmsg_recv(msg, skb); 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* Now we could try to dump offended packet options */ 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds msg->msg_flags |= MSG_ERRQUEUE; 4521da177e4SLinus Torvalds err = copied; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds out_free_skb: 4551da177e4SLinus Torvalds kfree_skb(skb); 4561da177e4SLinus Torvalds out: 4571da177e4SLinus Torvalds return err; 4581da177e4SLinus Torvalds } 459a495f836SChris Elston EXPORT_SYMBOL_GPL(ipv6_recv_error); 4601da177e4SLinus Torvalds 4614b340ae2SBrian Haley /* 4624b340ae2SBrian Haley * Handle IPV6_RECVPATHMTU 4634b340ae2SBrian Haley */ 46485fbaa75SHannes Frederic Sowa int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, 46585fbaa75SHannes Frederic Sowa int *addr_len) 4664b340ae2SBrian Haley { 4674b340ae2SBrian Haley struct ipv6_pinfo *np = inet6_sk(sk); 4684b340ae2SBrian Haley struct sk_buff *skb; 4694b340ae2SBrian Haley struct ip6_mtuinfo mtu_info; 470342dfc30SSteffen Hurrle DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); 4714b340ae2SBrian Haley int err; 4724b340ae2SBrian Haley int copied; 4734b340ae2SBrian Haley 4744b340ae2SBrian Haley err = -EAGAIN; 4754b340ae2SBrian Haley skb = xchg(&np->rxpmtu, NULL); 47663159f29SIan Morris if (!skb) 4774b340ae2SBrian Haley goto out; 4784b340ae2SBrian Haley 4794b340ae2SBrian Haley copied = skb->len; 4804b340ae2SBrian Haley if (copied > len) { 4814b340ae2SBrian Haley msg->msg_flags |= MSG_TRUNC; 4824b340ae2SBrian Haley copied = len; 4834b340ae2SBrian Haley } 48451f3d02bSDavid S. Miller err = skb_copy_datagram_msg(skb, 0, msg, copied); 4854b340ae2SBrian Haley if (err) 4864b340ae2SBrian Haley goto out_free_skb; 4874b340ae2SBrian Haley 4884b340ae2SBrian Haley sock_recv_timestamp(msg, sk, skb); 4894b340ae2SBrian Haley 4904b340ae2SBrian Haley memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); 4914b340ae2SBrian Haley 4924b340ae2SBrian Haley if (sin) { 4934b340ae2SBrian Haley sin->sin6_family = AF_INET6; 4944b340ae2SBrian Haley sin->sin6_flowinfo = 0; 4954b340ae2SBrian Haley sin->sin6_port = 0; 4964b340ae2SBrian Haley sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; 4974e3fd7a0SAlexey Dobriyan sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; 49885fbaa75SHannes Frederic Sowa *addr_len = sizeof(*sin); 4994b340ae2SBrian Haley } 5004b340ae2SBrian Haley 5014b340ae2SBrian Haley put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); 5024b340ae2SBrian Haley 5034b340ae2SBrian Haley err = copied; 5044b340ae2SBrian Haley 5054b340ae2SBrian Haley out_free_skb: 5064b340ae2SBrian Haley kfree_skb(skb); 5074b340ae2SBrian Haley out: 5084b340ae2SBrian Haley return err; 5094b340ae2SBrian Haley } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds 5124b261c75SHannes Frederic Sowa void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, 5134b261c75SHannes Frederic Sowa struct sk_buff *skb) 5144b261c75SHannes Frederic Sowa { 5154b261c75SHannes Frederic Sowa struct ipv6_pinfo *np = inet6_sk(sk); 5164b261c75SHannes Frederic Sowa bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); 5174b261c75SHannes Frederic Sowa 5184b261c75SHannes Frederic Sowa if (np->rxopt.bits.rxinfo) { 5194b261c75SHannes Frederic Sowa struct in6_pktinfo src_info; 5204b261c75SHannes Frederic Sowa 5214b261c75SHannes Frederic Sowa if (is_ipv6) { 5224b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = IP6CB(skb)->iif; 5234b261c75SHannes Frederic Sowa src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 5244b261c75SHannes Frederic Sowa } else { 5254b261c75SHannes Frederic Sowa src_info.ipi6_ifindex = 5264b261c75SHannes Frederic Sowa PKTINFO_SKB_CB(skb)->ipi_ifindex; 5274b261c75SHannes Frederic Sowa ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, 5284b261c75SHannes Frederic Sowa &src_info.ipi6_addr); 5294b261c75SHannes Frederic Sowa } 530829ae9d6SWillem de Bruijn 531829ae9d6SWillem de Bruijn if (src_info.ipi6_ifindex >= 0) 532829ae9d6SWillem de Bruijn put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, 533829ae9d6SWillem de Bruijn sizeof(src_info), &src_info); 5344b261c75SHannes Frederic Sowa } 5354b261c75SHannes Frederic Sowa } 5364b261c75SHannes Frederic Sowa 5374b261c75SHannes Frederic Sowa void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, 53873df66f8STom Parkin struct sk_buff *skb) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 5411da177e4SLinus Torvalds struct inet6_skb_parm *opt = IP6CB(skb); 542d56f90a7SArnaldo Carvalho de Melo unsigned char *nh = skb_network_header(skb); 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds if (np->rxopt.bits.rxhlim) { 5450660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 5461da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 54941a1f8eaSYOSHIFUJI Hideaki if (np->rxopt.bits.rxtclass) { 550e7219858SYOSHIFUJI Hideaki / 吉藤英明 int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); 55141a1f8eaSYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); 55241a1f8eaSYOSHIFUJI Hideaki } 55341a1f8eaSYOSHIFUJI Hideaki 5546502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (np->rxopt.bits.rxflow) { 5556502ca52SYOSHIFUJI Hideaki / 吉藤英明 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); 5566502ca52SYOSHIFUJI Hideaki / 吉藤英明 if (flowinfo) 5571da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); 5581da177e4SLinus Torvalds } 559333fad53SYOSHIFUJI Hideaki 560333fad53SYOSHIFUJI Hideaki /* HbH is allowed only once */ 5611da177e4SLinus Torvalds if (np->rxopt.bits.hopopts && opt->hop) { 562d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->hop; 5631da177e4SLinus Torvalds put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); 5641da177e4SLinus Torvalds } 565333fad53SYOSHIFUJI Hideaki 566333fad53SYOSHIFUJI Hideaki if (opt->lastopt && 567333fad53SYOSHIFUJI Hideaki (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { 568333fad53SYOSHIFUJI Hideaki /* 569333fad53SYOSHIFUJI Hideaki * Silly enough, but we need to reparse in order to 570333fad53SYOSHIFUJI Hideaki * report extension headers (except for HbH) 571333fad53SYOSHIFUJI Hideaki * in order. 572333fad53SYOSHIFUJI Hideaki * 573333fad53SYOSHIFUJI Hideaki * Also note that IPV6_RECVRTHDRDSTOPTS is NOT 574333fad53SYOSHIFUJI Hideaki * (and WILL NOT be) defined because 575333fad53SYOSHIFUJI Hideaki * IPV6_RECVDSTOPTS is more generic. --yoshfuji 576333fad53SYOSHIFUJI Hideaki */ 577333fad53SYOSHIFUJI Hideaki unsigned int off = sizeof(struct ipv6hdr); 5780660e03fSArnaldo Carvalho de Melo u8 nexthdr = ipv6_hdr(skb)->nexthdr; 579333fad53SYOSHIFUJI Hideaki 580333fad53SYOSHIFUJI Hideaki while (off <= opt->lastopt) { 58195c96174SEric Dumazet unsigned int len; 582d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + off; 583333fad53SYOSHIFUJI Hideaki 584333fad53SYOSHIFUJI Hideaki switch (nexthdr) { 585333fad53SYOSHIFUJI Hideaki case IPPROTO_DSTOPTS: 586333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 587333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 588333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.dstopts) 589333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); 590333fad53SYOSHIFUJI Hideaki break; 591333fad53SYOSHIFUJI Hideaki case IPPROTO_ROUTING: 592333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 593333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 594333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.srcrt) 595333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); 596333fad53SYOSHIFUJI Hideaki break; 597333fad53SYOSHIFUJI Hideaki case IPPROTO_AH: 598333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 599a3059893SVille Nuorvala len = (ptr[1] + 2) << 2; 600333fad53SYOSHIFUJI Hideaki break; 601333fad53SYOSHIFUJI Hideaki default: 602333fad53SYOSHIFUJI Hideaki nexthdr = ptr[0]; 603333fad53SYOSHIFUJI Hideaki len = (ptr[1] + 1) << 3; 604333fad53SYOSHIFUJI Hideaki break; 605333fad53SYOSHIFUJI Hideaki } 606333fad53SYOSHIFUJI Hideaki 607333fad53SYOSHIFUJI Hideaki off += len; 608333fad53SYOSHIFUJI Hideaki } 609333fad53SYOSHIFUJI Hideaki } 610333fad53SYOSHIFUJI Hideaki 611333fad53SYOSHIFUJI Hideaki /* socket options in old style */ 612333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxoinfo) { 613333fad53SYOSHIFUJI Hideaki struct in6_pktinfo src_info; 614333fad53SYOSHIFUJI Hideaki 615333fad53SYOSHIFUJI Hideaki src_info.ipi6_ifindex = opt->iif; 6164e3fd7a0SAlexey Dobriyan src_info.ipi6_addr = ipv6_hdr(skb)->daddr; 617333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); 618333fad53SYOSHIFUJI Hideaki } 619333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.rxohlim) { 6200660e03fSArnaldo Carvalho de Melo int hlim = ipv6_hdr(skb)->hop_limit; 621333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); 622333fad53SYOSHIFUJI Hideaki } 623333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.ohopopts && opt->hop) { 624d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->hop; 625333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); 626333fad53SYOSHIFUJI Hideaki } 627333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst0) { 628d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst0; 629333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6301da177e4SLinus Torvalds } 631333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.osrcrt && opt->srcrt) { 632d56f90a7SArnaldo Carvalho de Melo struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); 633333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); 6341da177e4SLinus Torvalds } 635333fad53SYOSHIFUJI Hideaki if (np->rxopt.bits.odstopts && opt->dst1) { 636d56f90a7SArnaldo Carvalho de Melo u8 *ptr = nh + opt->dst1; 637333fad53SYOSHIFUJI Hideaki put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); 6381da177e4SLinus Torvalds } 6396c468622SBalazs Scheidler if (np->rxopt.bits.rxorigdstaddr) { 6406c468622SBalazs Scheidler struct sockaddr_in6 sin6; 641747465efSEric Dumazet __be16 *ports = (__be16 *) skb_transport_header(skb); 6426c468622SBalazs Scheidler 6436c468622SBalazs Scheidler if (skb_transport_offset(skb) + 4 <= skb->len) { 6446c468622SBalazs Scheidler /* All current transport protocols have the port numbers in the 6456c468622SBalazs Scheidler * first four bytes of the transport header and this function is 6466c468622SBalazs Scheidler * written with this assumption in mind. 6476c468622SBalazs Scheidler */ 6486c468622SBalazs Scheidler 6496c468622SBalazs Scheidler sin6.sin6_family = AF_INET6; 6504e3fd7a0SAlexey Dobriyan sin6.sin6_addr = ipv6_hdr(skb)->daddr; 6516c468622SBalazs Scheidler sin6.sin6_port = ports[1]; 6526c468622SBalazs Scheidler sin6.sin6_flowinfo = 0; 6533868b7aaSHannes Frederic Sowa sin6.sin6_scope_id = 6543868b7aaSHannes Frederic Sowa ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, 6553868b7aaSHannes Frederic Sowa opt->iif); 6566c468622SBalazs Scheidler 6576c468622SBalazs Scheidler put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); 6586c468622SBalazs Scheidler } 6596c468622SBalazs Scheidler } 6604b261c75SHannes Frederic Sowa } 6614b261c75SHannes Frederic Sowa 6624b261c75SHannes Frederic Sowa void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, 6634b261c75SHannes Frederic Sowa struct sk_buff *skb) 6644b261c75SHannes Frederic Sowa { 6654b261c75SHannes Frederic Sowa ip6_datagram_recv_common_ctl(sk, msg, skb); 6664b261c75SHannes Frederic Sowa ip6_datagram_recv_specific_ctl(sk, msg, skb); 6671da177e4SLinus Torvalds } 6688e72d37eSTom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); 6691da177e4SLinus Torvalds 67073df66f8STom Parkin int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 6714c9483b2SDavid S. Miller struct msghdr *msg, struct flowi6 *fl6, 6721da177e4SLinus Torvalds struct ipv6_txoptions *opt, 67313b52cd4SBrian Haley int *hlimit, int *tclass, int *dontfrag) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds struct in6_pktinfo *src_info; 6761da177e4SLinus Torvalds struct cmsghdr *cmsg; 6771da177e4SLinus Torvalds struct ipv6_rt_hdr *rthdr; 6781da177e4SLinus Torvalds struct ipv6_opt_hdr *hdr; 6791da177e4SLinus Torvalds int len; 6801da177e4SLinus Torvalds int err = 0; 6811da177e4SLinus Torvalds 682f95b414eSGu Zheng for_each_cmsghdr(cmsg, msg) { 6831da177e4SLinus Torvalds int addr_type; 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds if (!CMSG_OK(msg, cmsg)) { 6861da177e4SLinus Torvalds err = -EINVAL; 6871da177e4SLinus Torvalds goto exit_f; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds if (cmsg->cmsg_level != SOL_IPV6) 6911da177e4SLinus Torvalds continue; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds switch (cmsg->cmsg_type) { 6941da177e4SLinus Torvalds case IPV6_PKTINFO: 695333fad53SYOSHIFUJI Hideaki case IPV6_2292PKTINFO: 696187e3838SYOSHIFUJI Hideaki { 697187e3838SYOSHIFUJI Hideaki struct net_device *dev = NULL; 698187e3838SYOSHIFUJI Hideaki 6991da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { 7001da177e4SLinus Torvalds err = -EINVAL; 7011da177e4SLinus Torvalds goto exit_f; 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds if (src_info->ipi6_ifindex) { 7074c9483b2SDavid S. Miller if (fl6->flowi6_oif && 7084c9483b2SDavid S. Miller src_info->ipi6_ifindex != fl6->flowi6_oif) 7091da177e4SLinus Torvalds return -EINVAL; 7104c9483b2SDavid S. Miller fl6->flowi6_oif = src_info->ipi6_ifindex; 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds 713187e3838SYOSHIFUJI Hideaki addr_type = __ipv6_addr_type(&src_info->ipi6_addr); 7141da177e4SLinus Torvalds 715536b2e92SEric Dumazet rcu_read_lock(); 7164c9483b2SDavid S. Miller if (fl6->flowi6_oif) { 7174c9483b2SDavid S. Miller dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); 718536b2e92SEric Dumazet if (!dev) { 719536b2e92SEric Dumazet rcu_read_unlock(); 7201da177e4SLinus Torvalds return -ENODEV; 721536b2e92SEric Dumazet } 722536b2e92SEric Dumazet } else if (addr_type & IPV6_ADDR_LINKLOCAL) { 723536b2e92SEric Dumazet rcu_read_unlock(); 724187e3838SYOSHIFUJI Hideaki return -EINVAL; 725536b2e92SEric Dumazet } 726187e3838SYOSHIFUJI Hideaki 727187e3838SYOSHIFUJI Hideaki if (addr_type != IPV6_ADDR_ANY) { 728187e3838SYOSHIFUJI Hideaki int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; 7292563fa59SMaciej Żenczykowski if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && 730ec0506dbSMaciej Żenczykowski !ipv6_chk_addr(net, &src_info->ipi6_addr, 7317c90cc2dSFX Le Bail strict ? dev : NULL, 0) && 7327c90cc2dSFX Le Bail !ipv6_chk_acast_addr_src(net, dev, 7337c90cc2dSFX Le Bail &src_info->ipi6_addr)) 7341da177e4SLinus Torvalds err = -EINVAL; 735187e3838SYOSHIFUJI Hideaki else 7364e3fd7a0SAlexey Dobriyan fl6->saddr = src_info->ipi6_addr; 7371da177e4SLinus Torvalds } 738187e3838SYOSHIFUJI Hideaki 739536b2e92SEric Dumazet rcu_read_unlock(); 7401da177e4SLinus Torvalds 741187e3838SYOSHIFUJI Hideaki if (err) 742187e3838SYOSHIFUJI Hideaki goto exit_f; 743187e3838SYOSHIFUJI Hideaki 7441da177e4SLinus Torvalds break; 745187e3838SYOSHIFUJI Hideaki } 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds case IPV6_FLOWINFO: 7481da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(4)) { 7491da177e4SLinus Torvalds err = -EINVAL; 7501da177e4SLinus Torvalds goto exit_f; 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7534c9483b2SDavid S. Miller if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { 7544c9483b2SDavid S. Miller if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { 7551da177e4SLinus Torvalds err = -EINVAL; 7561da177e4SLinus Torvalds goto exit_f; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds } 7594c9483b2SDavid S. Miller fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); 7601da177e4SLinus Torvalds break; 7611da177e4SLinus Torvalds 762333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPOPTS: 7631da177e4SLinus Torvalds case IPV6_HOPOPTS: 7641da177e4SLinus Torvalds if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 7651da177e4SLinus Torvalds err = -EINVAL; 7661da177e4SLinus Torvalds goto exit_f; 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 7701da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 7711da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 7721da177e4SLinus Torvalds err = -EINVAL; 7731da177e4SLinus Torvalds goto exit_f; 7741da177e4SLinus Torvalds } 775af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 7761da177e4SLinus Torvalds err = -EPERM; 7771da177e4SLinus Torvalds goto exit_f; 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds opt->opt_nflen += len; 7801da177e4SLinus Torvalds opt->hopopt = hdr; 7811da177e4SLinus Torvalds break; 7821da177e4SLinus Torvalds 783333fad53SYOSHIFUJI Hideaki case IPV6_2292DSTOPTS: 7841da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 7851da177e4SLinus Torvalds err = -EINVAL; 7861da177e4SLinus Torvalds goto exit_f; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 7901da177e4SLinus Torvalds len = ((hdr->hdrlen + 1) << 3); 7911da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 7921da177e4SLinus Torvalds err = -EINVAL; 7931da177e4SLinus Torvalds goto exit_f; 7941da177e4SLinus Torvalds } 795af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 7961da177e4SLinus Torvalds err = -EPERM; 7971da177e4SLinus Torvalds goto exit_f; 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds if (opt->dst1opt) { 8001da177e4SLinus Torvalds err = -EINVAL; 8011da177e4SLinus Torvalds goto exit_f; 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds opt->opt_flen += len; 8041da177e4SLinus Torvalds opt->dst1opt = hdr; 8051da177e4SLinus Torvalds break; 8061da177e4SLinus Torvalds 807333fad53SYOSHIFUJI Hideaki case IPV6_DSTOPTS: 808333fad53SYOSHIFUJI Hideaki case IPV6_RTHDRDSTOPTS: 809333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { 810333fad53SYOSHIFUJI Hideaki err = -EINVAL; 811333fad53SYOSHIFUJI Hideaki goto exit_f; 812333fad53SYOSHIFUJI Hideaki } 813333fad53SYOSHIFUJI Hideaki 814333fad53SYOSHIFUJI Hideaki hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); 815333fad53SYOSHIFUJI Hideaki len = ((hdr->hdrlen + 1) << 3); 816333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_len < CMSG_LEN(len)) { 817333fad53SYOSHIFUJI Hideaki err = -EINVAL; 818333fad53SYOSHIFUJI Hideaki goto exit_f; 819333fad53SYOSHIFUJI Hideaki } 820af31f412SEric W. Biederman if (!ns_capable(net->user_ns, CAP_NET_RAW)) { 821333fad53SYOSHIFUJI Hideaki err = -EPERM; 822333fad53SYOSHIFUJI Hideaki goto exit_f; 823333fad53SYOSHIFUJI Hideaki } 824333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_DSTOPTS) { 825333fad53SYOSHIFUJI Hideaki opt->opt_flen += len; 826333fad53SYOSHIFUJI Hideaki opt->dst1opt = hdr; 827333fad53SYOSHIFUJI Hideaki } else { 828333fad53SYOSHIFUJI Hideaki opt->opt_nflen += len; 829333fad53SYOSHIFUJI Hideaki opt->dst0opt = hdr; 830333fad53SYOSHIFUJI Hideaki } 831333fad53SYOSHIFUJI Hideaki break; 832333fad53SYOSHIFUJI Hideaki 833333fad53SYOSHIFUJI Hideaki case IPV6_2292RTHDR: 8341da177e4SLinus Torvalds case IPV6_RTHDR: 8351da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { 8361da177e4SLinus Torvalds err = -EINVAL; 8371da177e4SLinus Torvalds goto exit_f; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); 8411da177e4SLinus Torvalds 842280a9d34SMasahide NAKAMURA switch (rthdr->type) { 84307a93626SAmerigo Wang #if IS_ENABLED(CONFIG_IPV6_MIP6) 844280a9d34SMasahide NAKAMURA case IPV6_SRCRT_TYPE_2: 8456e093d9dSBrian Haley if (rthdr->hdrlen != 2 || 8466e093d9dSBrian Haley rthdr->segments_left != 1) { 8476e093d9dSBrian Haley err = -EINVAL; 8486e093d9dSBrian Haley goto exit_f; 8496e093d9dSBrian Haley } 850280a9d34SMasahide NAKAMURA break; 851bb4dbf9eSYOSHIFUJI Hideaki #endif 852280a9d34SMasahide NAKAMURA default: 8531da177e4SLinus Torvalds err = -EINVAL; 8541da177e4SLinus Torvalds goto exit_f; 8551da177e4SLinus Torvalds } 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds len = ((rthdr->hdrlen + 1) << 3); 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds if (cmsg->cmsg_len < CMSG_LEN(len)) { 8601da177e4SLinus Torvalds err = -EINVAL; 8611da177e4SLinus Torvalds goto exit_f; 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds /* segments left must also match */ 8651da177e4SLinus Torvalds if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { 8661da177e4SLinus Torvalds err = -EINVAL; 8671da177e4SLinus Torvalds goto exit_f; 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds opt->opt_nflen += len; 8711da177e4SLinus Torvalds opt->srcrt = rthdr; 8721da177e4SLinus Torvalds 873333fad53SYOSHIFUJI Hideaki if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { 8741da177e4SLinus Torvalds int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds opt->opt_nflen += dsthdrlen; 8771da177e4SLinus Torvalds opt->dst0opt = opt->dst1opt; 8781da177e4SLinus Torvalds opt->dst1opt = NULL; 8791da177e4SLinus Torvalds opt->opt_flen -= dsthdrlen; 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds break; 8831da177e4SLinus Torvalds 884333fad53SYOSHIFUJI Hideaki case IPV6_2292HOPLIMIT: 8851da177e4SLinus Torvalds case IPV6_HOPLIMIT: 8861da177e4SLinus Torvalds if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { 8871da177e4SLinus Torvalds err = -EINVAL; 8881da177e4SLinus Torvalds goto exit_f; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds *hlimit = *(int *)CMSG_DATA(cmsg); 892e8766fc8SShan Wei if (*hlimit < -1 || *hlimit > 0xff) { 893e8766fc8SShan Wei err = -EINVAL; 894e8766fc8SShan Wei goto exit_f; 895e8766fc8SShan Wei } 896e8766fc8SShan Wei 8971da177e4SLinus Torvalds break; 8981da177e4SLinus Torvalds 89941a1f8eaSYOSHIFUJI Hideaki case IPV6_TCLASS: 90041a1f8eaSYOSHIFUJI Hideaki { 90141a1f8eaSYOSHIFUJI Hideaki int tc; 90241a1f8eaSYOSHIFUJI Hideaki 90341a1f8eaSYOSHIFUJI Hideaki err = -EINVAL; 904b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 90541a1f8eaSYOSHIFUJI Hideaki goto exit_f; 90641a1f8eaSYOSHIFUJI Hideaki 90741a1f8eaSYOSHIFUJI Hideaki tc = *(int *)CMSG_DATA(cmsg); 908d0ee011fSRemi Denis-Courmont if (tc < -1 || tc > 0xff) 90941a1f8eaSYOSHIFUJI Hideaki goto exit_f; 91041a1f8eaSYOSHIFUJI Hideaki 91141a1f8eaSYOSHIFUJI Hideaki err = 0; 91241a1f8eaSYOSHIFUJI Hideaki *tclass = tc; 91341a1f8eaSYOSHIFUJI Hideaki 91441a1f8eaSYOSHIFUJI Hideaki break; 91541a1f8eaSYOSHIFUJI Hideaki } 91613b52cd4SBrian Haley 91713b52cd4SBrian Haley case IPV6_DONTFRAG: 91813b52cd4SBrian Haley { 91913b52cd4SBrian Haley int df; 92013b52cd4SBrian Haley 92113b52cd4SBrian Haley err = -EINVAL; 922b5a4257cSEldad Zack if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 92313b52cd4SBrian Haley goto exit_f; 92413b52cd4SBrian Haley 92513b52cd4SBrian Haley df = *(int *)CMSG_DATA(cmsg); 92613b52cd4SBrian Haley if (df < 0 || df > 1) 92713b52cd4SBrian Haley goto exit_f; 92813b52cd4SBrian Haley 92913b52cd4SBrian Haley err = 0; 93013b52cd4SBrian Haley *dontfrag = df; 93113b52cd4SBrian Haley 93213b52cd4SBrian Haley break; 93313b52cd4SBrian Haley } 9341da177e4SLinus Torvalds default: 935ba7a46f1SJoe Perches net_dbg_ratelimited("invalid cmsg type: %d\n", 93664ce2073SPatrick McHardy cmsg->cmsg_type); 9371da177e4SLinus Torvalds err = -EINVAL; 9384a36702eSMiao Xie goto exit_f; 9393ff50b79SStephen Hemminger } 9401da177e4SLinus Torvalds } 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds exit_f: 9431da177e4SLinus Torvalds return err; 9441da177e4SLinus Torvalds } 94573df66f8STom Parkin EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); 94617ef66afSLorenzo Colitti 94717ef66afSLorenzo Colitti void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, 94817ef66afSLorenzo Colitti __u16 srcp, __u16 destp, int bucket) 94917ef66afSLorenzo Colitti { 95017ef66afSLorenzo Colitti const struct in6_addr *dest, *src; 95117ef66afSLorenzo Colitti 952efe4208fSEric Dumazet dest = &sp->sk_v6_daddr; 953efe4208fSEric Dumazet src = &sp->sk_v6_rcv_saddr; 95417ef66afSLorenzo Colitti seq_printf(seq, 95517ef66afSLorenzo Colitti "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 956d14c5ab6SFrancesco Fusco "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 95717ef66afSLorenzo Colitti bucket, 95817ef66afSLorenzo Colitti src->s6_addr32[0], src->s6_addr32[1], 95917ef66afSLorenzo Colitti src->s6_addr32[2], src->s6_addr32[3], srcp, 96017ef66afSLorenzo Colitti dest->s6_addr32[0], dest->s6_addr32[1], 96117ef66afSLorenzo Colitti dest->s6_addr32[2], dest->s6_addr32[3], destp, 96217ef66afSLorenzo Colitti sp->sk_state, 96317ef66afSLorenzo Colitti sk_wmem_alloc_get(sp), 96417ef66afSLorenzo Colitti sk_rmem_alloc_get(sp), 96517ef66afSLorenzo Colitti 0, 0L, 0, 96617ef66afSLorenzo Colitti from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 96717ef66afSLorenzo Colitti 0, 96817ef66afSLorenzo Colitti sock_i_ino(sp), 96917ef66afSLorenzo Colitti atomic_read(&sp->sk_refcnt), sp, 97017ef66afSLorenzo Colitti atomic_read(&sp->sk_drops)); 97117ef66afSLorenzo Colitti } 972